Myth: Carbon dioxide is the most potent greenhouse gas
Truth: No, that would be water vapor of which there is an abundance in the atmosphere, then there is methane, and nitrogen trifluoride used in the manufacture of flat screen TVs.

Myth: If we accept it as real, we can do something about it.
Truth: We cannot even control local weather, what makes us think carbon sequestration and seeding the oceans, etc. will allow us to affect the climate. These come from a science web site.